Territory



UNTTED sTATEs PATENT oEEToE.

JOSHUA HOBART, OF DUBUQUE, IOWA TERRITORY.

MINING-AUGER.

Specification lof Letters Patent No. 4,531, dated May 23, 1846.

T0 all whom it may concern A Be it known that I, JOSHUA HoART, of Dubuque, in the Territory of Iowa, have invented a new and useful Machine for the Purpose of Boring the Earth, which I call a mining-auger and I do hereby declare that the following is a full, clear, and eXact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1 is a perspective view of the whole machine for boring the earth. Fig. 2, represents the machine with the spiral for elevating stones. Fig. 3 is the bottom View. Fig. 4 the manner of connecting o-r lengthening the shaft. Fig. 5, a side view of one of the plows. y

In Fig. l, A is a cylinder of iron, cast or otherwise, open at the upper part and having a bottom, L fastened by means of screws, G and c. In the center of the bottom L, is a shaft, cast to the bottom part of the cylinder in which is screwed a part of the shaft E. In the bottom L, are two oblique openings M, M, which are closed by shutters to valves F, F, they being fastened. to the botto-m by hinges, opening on the inside of the cylinder. Under the shutters F, F, are two knives O O. Attached outside of the bottom L, are cleats D &c. C, &c. are plows having wedge shaped bases fastened under the cleats or dovetails D, Sac. In the center of the bottom L is a female screw, P. B is an auger screwing into P.

In Fig. 2 is a corresponding view of Fig. l, with the exception, that instead of the auger B, which screws into I), isa spiral, conical screw I, for the purpose of elevating stones of such size as will not pass the openings M, M.

In Fig. 3, is a representation of the inside of the bottom L. Gr &c. are screws fastening the bottom to the cylinder as before described. F, F, the shutters. H, H, the hinges. I &c. are dotted lines of the screws that fasten the knives O, O, to the bottom L, as seen in Fig. 2.

Fig. 4 is a view of the shaft E, and the mode of connecting it, in which the port S, screws into R in Fig; 3.

Fig. 5, is a view of the plow for working in hard earth.

The operation of the machine consists in placing a common lever upon the shaftE, and turning it as an auger, the screw B works into the earth, the plows loosen it, and by turning the loose earth is forced through the apertures M M, into the cylinder until it is full, by stopping the turning motion the trap doors F, F, shut by their own gravity and thus secure the earth that has been forced into the cylinder which is then elevated and the contents displaced. This operation is to be repeated until any required depth is obtained.

Should stones arrest the operation of boring, the screw B and the plows C, &c., are

S. A. FENGH, AUGUST A. VON SoHMmT. 

